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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa3fa5ef74bd60884bf0633563a241efab60c99544e7ff54616430118c2bb27' 
  AND token = '15CwJKvvzArsUROVHBEEqe2sBwsBcdKYlwQy1s5MF5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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