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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adabd8f4b11ff0b2d86142b313c0b656185b5b46b670af05051d94615a48a7c' 
  AND token = 'fPydfvn4cOjYRe3YyJjGIzgryIk63n2y3tWTKz75QhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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