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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d96fcee465b7e286ba5cee80063dbd164ce33dd451b6a7001928cc7f5c73dc' 
  AND token = 'IdkklhJk0Qquk5m7BQ+OSyOttSCLXpJrdZ9yiaq2ung=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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