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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575261f0936be2bac4b5c08f3c59ac9da7b23e047ac192b3a3418b67eff52363' 
  AND token = 'KUTfMnMBFeQZzzipc0iT2jU57qgOIJb+eRDD1M7gKWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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