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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8e0b2ba8251d2fc472ef5ee2e15f9d6540b3e927b9494fefc70fb5828b9714' 
  AND token = '/oe0ElNlUEn+eK/0djh5USIPoNwNjy8DEtGmtyswB9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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