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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fceaea2f595340e6ba310ebf97480a7b8fc4612a7e35c62b3f27d2211f647b' 
  AND token = 'J1XfGj9rfJRn+YXF0DwfbnDcbBEe4Ijf6tCL9J6FkLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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