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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389ad37db20b4cbfcd95e381e036d2df0689dab957923631031b73b1127aad8c' 
  AND token = '/MTR38zJKLDjNNDZ9KL9G52nlTFGxG33zRa9ZxvC89o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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