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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c971b8e149b0769365f1a4674fa797be117b61db82dc2101da61e062a9c79f' 
  AND token = 'DVIRV30Lge/JrVPrVnMM9fVa8bAGFGoemG074UOxCxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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