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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3383175e0283c15cb41b0c9d65ed79964953eb44f2587dcf2f55f752c577e3' 
  AND token = '2dbAguhFejAzXD8QjNDwQf+ffcd34O2r/3ECiSs2lGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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