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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0e6b0478d5224959afc15f9154beb493c089b302af9626c5f28b173e219df8' 
  AND token = 'RduUvLN/8mb/Sn13sdjCLIQBQ6pGC6COuoPd5suJOGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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