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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b6817bfc53e4e843282b3b120672fd77f3ee691416afe6fb7e9a61ee083fa4' 
  AND token = 'de7QmYXF1O3H17MYWb5fVgydA+/AS1/Ebjp4pWqZhZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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