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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6234e107a00046b7b60b5df8eb9fd23ebd9cc41b82c1d4f7bccfe8202ae55978' 
  AND token = '785MFys2jETtArue6OakJ8AhnYLy8TXRA/hFnYPaeBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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