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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7af4b3c7e13085c707cf9257cc80e1e44f504a89cbc0b7409b2caa7621a5051' 
  AND token = 'X8QF11dipNgvm3/aPSohLu0fIN09JiDbTUVMwHuwuFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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