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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb1d45629a414f095b52bdc1a4a5d2109799f9cb47f8a727b4dc5bfcf9d3187' 
  AND token = 'Ooehec9lKKDTsgz2GmOSD4FvUKsevnXscWv2oMAWzKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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