SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eba3b06e6cba960caec2d41ff266ce81e301247f229d7e576f04184405c4045' 
  AND token = 'ijhWFVawZpZ+gq1LV2VJ1i0f+E/Wzjrw5xKw6ysWjSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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