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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c26ccbf0e62b95b61bd95ac897dcfdffb837aff89ba65376ebe1614c72accb7' 
  AND token = 'Z+i4227NSriOUbmzQUpzQ08/Hx1XW8SNI4RuemM0oXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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