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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d93a2143830708c0bfca54210436fb0ec5cdca31d806ff3d93f7e3bcd277db7' 
  AND token = 'iOghlJVjlwWD40Vhly8RscBmKGngOCofDIfd33OqGoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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