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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67155d7a38a977acf9a1e0d412b11c316f1b4a658092838eceafc23be072bc61' 
  AND token = '9X0OTEH3CUoNZCu6wmSCOZriUZry9LJ1+6iNfKEQUPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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