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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1843533aabdaf6a69ee045de14d0cce009b4fea789caf3302733a7ed5c088c4' 
  AND token = 'cqMX4KnVd50YlFt2zQPkw1PxoMlkx2PItMSRMEF8NN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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