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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e85cd1ccd392d59840c84f80e8d82d8ce1876d0a6b83382f21690486d2dd69' 
  AND token = 'Hzy+fTGGsdhecEwqLtRaKz7KqUb5wD53fZaW9q5vWRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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