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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f0144cafa216909c74153fa5e3f6293507fe8c1920666544ab2e2d3853a4da' 
  AND token = 'TRBUf5oyCi62RmKtOXZm4RrgTZcP8XzDrT3uL70wlBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}