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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b46717753fda3e477a9770af567c47074b2b602035729cb6ee0d1b60b3585af' 
  AND token = 'NVM55bvy24zgQpMESD5ahToqV9mi95DPw6YawNQblGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00160

JSON explain

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