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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2567f18a519ca4e61ae3f410209f4708bbf1d397dfe3f2c9cb70e1e620c91a76' 
  AND token = 'WlQvYmvjIe78eIhQXKS1zarfsyjCLEhys11i6DwR5AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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