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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb0a28c56f03e71ada29eb682076fa6f76e1febbd39cd3dfae4fe82c1873d9c' 
  AND token = 'YbNP7JoHc+2DUSEiRlB6VeG7x87jRAMFjDY+QsJFe9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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