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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534acda9c18359f196986903aa0bb6079a43d934c9a8f912e89409b40cd1d47a' 
  AND token = 'ozztmUtidJvE9L+O1WeWiuz1hxNtSF4k9aYDEsL830E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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