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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc90d78a2ec009bbd1f4eef2506de16f79d89215255095eae06a9a15b6b712c9' 
  AND token = 'CK2X2SpwFFjdslfnvpCEOmheIH6rJT+6PxV3tLOA7UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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