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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ce9d7ee2ec873ea193c449af19c460a7edc432bb7823d7f40c8504f78401f9' 
  AND token = '+/DFeEB1hTKFYPnylX/RCcZvL/J7vAeD0VxXZo5eQig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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