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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d37285bcc39c4ff44a1f5a13800de4214f015f6e0ce28e9bfb52c1af4d659d5' 
  AND token = 'eKyeLXQa3ovGaqqiKPLyaW2Rw4GSge3/70BAETOtzMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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