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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32320eef5882bec37077eb7e903924719cbb7261822f9d7ecc5d2c6f0c8b13a6' 
  AND token = 'yzHFDq1wiUPgFCFRArPECuyq2LIPtiTw+bIaxe3+JOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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