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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e23d62b1e1f5d346e036a8d8a70fc681d59518592c6465eeba44c4088e69af8' 
  AND token = 'FzEoreZ7PsK6k/mCwS/5oLO4sZ5jXTvl5GU/eJQxbm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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