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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbb870b976e30a3cf535e2a3984d216bcc82aa3a76110ecf11f30f4a3fce880' 
  AND token = 'Ul17F9muOjLuhLJK2gxgdaah2wx3u9OgKbag+k/y4Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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