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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfe48054e44cfdd774fb41bc2c89b3dfda4bece18a4050cb209439e06b59419' 
  AND token = 'T94XXwJzLHhLFDMOZ99/SA3DV3Lv4lGaqYBzEA+a8MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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