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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc4cc16801c4ee894de3aa7e7e9ea8eae4035e33f167a2804afc6244132fe33' 
  AND token = '8ryK+cOBO1tTw/wqG8A22jVaIHYK2LPw6z/zkBB75LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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