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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcaa7ef36e014c1ac9bb6fb8e21b93925af693d8c1db854f4e4a4500aeb0605' 
  AND token = '2aqT4X0dZRTdpwdUQtsYSuqyrGBYyg/3IFO8dKjO848=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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