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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494e3e3bae00aface5af1d2f1ccc4214829a5207aa44d9f7cbd2f74a491d8c4e' 
  AND token = 'gyShX8u4MyNCwiNj/MgjSJ36OWWBzZwY/bMij05BaE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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