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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8e13b60eb34851eb609c02f7dcc1174787c3df07626b0c2bbfc651153c2eb1' 
  AND token = 'B7bfOndSKjYQLp1HHKGLpnQK3n60eF3gLWy9W0t1F9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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