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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44af7dfaeb9b6125e8e8e8999b8a1fe2f2bdaf88967047f08d8b6617344e956' 
  AND token = 'Abow+tK0tYK+zLtim11Kom5QojaSwCxHsvw5OfgMR9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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