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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1891b82b8bb44f984daa7f9a2306a4bc7b54b5eb5bbc3f0cb01449c95585d5d' 
  AND token = 'kJ74Hb1KeBsGkjW9XqNbh5HCBHcmsFg2znkgYFLLerw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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