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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a32ddd5be1b75219a3c00d69bf19a8cf1eb744c953cb6df10c898b285872b4' 
  AND token = 'jx7s6fnnCf8q9g/hOD8yH0n3MbK6SMc1hEGcH9RQKxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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