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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e5b9389d0c4b960031c81506e9951ed1c18022d344f0036afdebb0b907e3a1' 
  AND token = 'wCc5m7VhWtnVspaA1iW8l8W0GvLIYx6zU4VuNeTcaVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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