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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7e9cdddf1e4ca636ef17b57ea6c97d94fb4d6afefabc808044fdcac82ec700' 
  AND token = 'OU55z0abDfzP8vaa/qOZHvycgy8aTHgz8IhVJOxVS4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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