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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac8154d2077262826d67614a927e5f71c4703588479f99b12beb630fab3c118' 
  AND token = 'MJiK1GkYAaJYAi8jMMQGDzROpEPxG1/rfE8x5bsFJSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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