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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7299a3d60295f9848e327d03900348fb4367b4a83ef23e46fc2573f9b02751c' 
  AND token = '7YEwMLH+HT+eawimA5Xer9bxvyszoEMKTjNTrv7zTRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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