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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2db5a8b5c3775c4ab4e2a3ad81cb46f7e6f67bca3b1d7e0651cae0f54335436' 
  AND token = 'haOIvBc01/L806sgXVJh82wcrnYMwS/Og2f8ttHSpCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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