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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf3a762b1837796a85e4cf8732f1c0b48848a1ba4b08412751c69a26a24c69e' 
  AND token = 'kzjLb6X2Qz98tJr10MXcow9FbjCPiSLvIGErJMNOFvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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