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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ffbed2c253e9ec013fd800a09975b9e3c3ae8d5ab8fa962d16305c890e45fb' 
  AND token = '/mIurfez37OV2ixr2bgrr0cDvtuJFFg+fbNP2VZFf60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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