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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3280e11c29ba5f7f0466df88dde7c9d2b771e78c911a91ed0822693cc4ab27' 
  AND token = '0GGxszGi1BfqnjvL0vxQiokxOgM0VltXRL3voH2g+HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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