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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcc1cf047a3630e53ce2d3f6f09e57061b301ebfbb65b9570f2ea5dc50bafff' 
  AND token = 'UEb6jLiiuv3gxnYADjYs0TKft499UVaesIzFZumMvNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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