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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2cccb9512fc7f0e866b89b50d3b02c0bee2171d3a8ab4c926ff0067e30cbdd5' 
  AND token = 'EGl42rx2tYyWWI9dOfMe2iwawOzgQu70A4lcBauVHfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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