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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1f9c170b9d09d4789568f73020a7f13612eec613e1b57913fa6edc8a2ec4bd' 
  AND token = 'Ca4bDnxCffAoNLmxT/kNO8iU3gYHUExyM1lkaZq6aS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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