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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d3ec51144ee0b1250bfe8e7616ec9afd22bc41ba56b7927bb11e1ec5deafa8' 
  AND token = 'oH80LaDIkV1J6PUHvRK+Y86i2zVeAx4W3vSG9Wy0gQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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