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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e698209fdbe45460261646eb768424044d26d264717a9425d6e5bae941b5d7b0' 
  AND token = 'YsashanzX+z54Wj/k6Hh1ARShseRQmsFK0Obe9eLAYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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