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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0779583206486429fd8074d9024cda45a9ac0f49854f3cbc5387cf5d6f2a21d5' 
  AND token = '8wG0hCa8XxnmhZVVCfZOa6w3VSpyM7fnr8hK8CBibKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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