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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33167d89799d8557a8dc5a2bf8e8323ae5962ce20148fa7a7e98f1880406cde' 
  AND token = 'b98JuNGgB5biMPiy9lb98r5jd03gRPcIC56w72G/Uys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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