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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b87d15e7f28bf7def0ed55c35f7ae8514e26822e70187ec71da191a672a539' 
  AND token = 'zJ4648NtclG/HIkWAuiJJAzgR/D2bUTbfaaQ+El04kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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