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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '222c13591cb4b5552b3188e2f80425f6d350b6772e871ca463354aa3c3bd3ec0' 
  AND token = 'jbjhQzMTUyFU7kGBpSECqthOwjgUEWQ5MX5OXpdI7oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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