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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e79cf0a6251df852ba6d6832665fcd9935486b363a50dbf1648cf283aa81a4e' 
  AND token = 'BH1T+KLE8EUyhREHX39/0EDXRFrU5MaTcolsHte4TCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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