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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d67947ca4080d1f552b6c102d2ea628c43d8fd9a3efd5f6ba01d2933ed9c428' 
  AND token = '4btIurTR8Ft31ullnol3pI5hMPYY0oxjPgHuEebBABQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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