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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d82dec7fb58b527a37f8d9179b0106fb4da8ba9c610cc66fee6c2148834e47' 
  AND token = 'ZSn4Oa/9f76XtpH0Jo7uNMAclAClfopEvEh1BUKD3sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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