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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8332fb91a008d8487212eaa50c757446053ff2eb7bf497efb9ea174e835ef6e1' 
  AND token = 'IHmvtYlxLaXs51ue3IHhK+Ac4DeGjlHqJTemgMPgoQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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