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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422196a8785c043c53962d359a1e2ad0d0dbf2d1092da9b30dcdf3720a6a3905' 
  AND token = 'zzBZ1eAIlrSJH12XSuOsCwdtRKBUlIgdvo8CXl6qDF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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