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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5806d8d98d5e60142d469df568852b561bbd6ad3282c5d5fde5a1d4577171c67' 
  AND token = 'oLDUgqfHuizpQmsxqQqF6Wu6fFKUGBjlnn+kkDYSass=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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