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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb352a692c750617b329088eefd41e10b57dc89a8e99ab48853006e0c686517' 
  AND token = '9aOmirwTY+Ym9N4PkmxK+VffhMk9v7Cxg2yJyMz2uUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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