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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ff0262a4fee82ff6aa4eb62dd3fefefe329838d65645ad06f2af361d2556d8' 
  AND token = 'xbmBHVoxpsdVwp30iaH+wq+kummWDQQu8LcQCQZHG3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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